well i think the toxic people are everywhere when a thing gets massive the more toxic people is on it just by numbers, but in games like fall guys you can't rlly be that much toxic in a game where just one person wins, the more oriented on a team pvp games gets people start being shit with the others.
I used to play lots of league of le6ends when is was in highschool, ranking to git gud, i was not allways happy or wanted to carry people talking shit to every one, the more close to medium skill is where the most toxic people are, when people are good enough to not lose an entire match by themselves, but not good enough to win by themselves eather is when the toxic people shine.
I don´t rlly associate toxic games with their comunity the same i do with other stuff like um lets say sports, the game is not toxic by it self is the people that are toxic.
and most of this games that comes with their toxic comunnities have also their's good ones, you can find discords,faceb00k,twitter pages of any of those games with strict rules of no toxicity that just post memes and guides all day and just chill around.
i have to admit that pvp games with a major number of toxic players can ruin the experience or the time you play, afk,rage quit,insult,feed etc cause you invest time to play and when 1 out of 10 people or so is an asshole it doesen't matter if the other 9 people want to chill and play happy, the technical disadvantage of having 1 less player is still there and can ruin the joy of the experience.
i do not rlly come to a major solution for making my experience with massive pvp games more enjoyable than Close chat and play with friends. so i left them while ago cause there are many many other games out there.
have a nice day.